William mavee



(No Model.)

W. MAVER, Jr.

QUADRUPLBX TELEGRAPH.

No. 349,945. Patented Sept. 28, 1886.

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UNITED STATES VJILLIAM MAVER, JR, OF JERSEY CITY, NEYV JERSEY, ASSIGNOR TO THE BALTIMORE & OHIO TELEGRAPH COMPANY, OF BALTIMORE, MD.

QUADRUPLEX TELEGRAPH.

SPECIFICATION forming part of Letters Patent No. 3-k9,95, dated September 28, 1886.

Application filed October 9, 1885.

T aZZ whom it may concern:

Be it known that 1, WILLIAM MAVER, Jr., a citizen of the United States. residing in J erscy City, in the county of Hudson and State of 5 New Jersey, have invented certain new and useful Improvementsin Means for Preventing False Signals in QuadrupleX Telegraphs, of which the following is a specification.

The invention relates to the organization of circuits and apparatus for overcoming or counterbalancing the effects produced by the static discharge of the main line of a duplex or quadruplex telegraph system.

The invention consists, in general terms, in

r 5 applying to the coils of the receiving-instrument supplementary or additional coils included in a conductor extending from the main line to one plate of a condenser, the remaining plate of which is connected with the artificial line at a point between the earth and a portion of the artificial resistance.

The accompanying drawing is a diagram showing an organization embodying the features of the invention.

Referring to the drawing, L represents a telegraph main line, and K a key system for transmitting the required classes of currents thereto from a battery, 0. A conductor, 1, leads from the key to a point, 2, where the two arms w and w of a \Vheatstone bridge diverge. The arm 10 is connected with the main line L at a point, 3. The arm w is connected with an artificial line, I, at a point, 4. The points 3 and 4 are connected with each 5 other by a bridge-conductor, w, in which there are included one coil or set of coils of the two receiving-instruments R and R The instrument R is represented as a polar relay, and is provided with a second set of coils included in a conductor, 5, leading from a point, 6, in the main line to a plate, a, ofa condenser, O. The instrument RE, which is represented as a neutral relay, is also constructed with two coils, r and 0", the former of which is included in the bridge-conductor 40 as already stated, while the second coil, 1, is included in the conductor 5. The remaining plate 0 of the condenser is connected with the artificial line Z at a point, 7, intermediate between the two sections 6' and e of the arti- Scrial No. 179,418. (No model.)

ficial resistance E, employed for equalizing the line resistance. The coils of the instruments It and R are so connected in the conductor 5 that the effects of the discharge of the condenser therethrough shall tend to neutralize the discharge of the main line. It will be readily understood that the charge taken by a condenser will depend upon the difference in potential of the points 6 and 7, with which the respective plates are connected. For this reason a portion, 6, of the resistance Eis located between the point! and the bridge, and the greater the amount of this resistance the greater will be the charge taken on by the condenser. It is desirable, also, that a portion of the artificial-line resistance shall be between the point 7 and the earth.

It will be apparent that when a current is transmitted from the battery Oto line a charge will be received by the condenser O. The dis- 7o charge of the line L will tend to produce a false signal by traversing the bridge-conductor w. The current or impulse from the plate 0 upon the discharge of the condenser 0, however, will neutralize the effects of the linedischarge in the receiving-instruments. It is also apparent that by a simple arrangement the resistance 6* could be obtained from the coils of the rheostat used to form an artificial line in duplex or quadruplex telegraphy, thus dispensing with the expense of additional rheostats.

I claim as my invention 1. The combination, substantially as hereinbefore set forth, of a telegraph main line, an artificial line, one or more receiving-instruments, means for transmitting currents upon the line without affecting the instruments, a condenser, conductors connecting the respective plates of said condenser with the main line 0 at a point between the instruments and the main line, at an intermediate point in the artificial line, and additional coils applied to said receiving instrument or instruments and included in one of said conductors.

2. The combination, substantially as hereinbefore set forth, of a telegraph main line, an artificial line, a receiving-instrument, means for causing incoming currents to traverse said instrument while it remains unaffected by outgoing currents, an artificial resistance, a condenser, conductors connecting the-respective plates with the main line at a point between the instruments and the main line and the earth, through said resistance, an artificial resistance between the ends of the conductors so connected, and independent coils applied to said receiving-instrument and included in one of said conductors.

3. The combination, substantially as hereinbefore set forth, of the main line, the artificial line containing the resistances e and 6 one or more receiving-instruments, the condenser having one plate connected with the main line at a point, 6, beyond the instruments, and the other with the artificial line between the resistances e and c and additional coils applied, to said receiving instrument or instruments included in one of said conductors.

bridge to a pointof lower potential in the artificial line, and neutralizing-coils applied to the receiving-instruments included in said condenser-circuit.

In testimony whereof I have hereunto subscribed my name this 8th day of October, A. D. 30

' WILLIAM MAVER, JR.

Witnesses:

DANL. W. EDGEOOMB, CHARLES A. TERRY. 

